Since this is labeled as part1.rar , you will need all subsequent parts (e.g., part2.rar , part3.rar ) in the same folder to successfully extract the game files.
The file appears to be a compressed archive for the medieval city-building game Foundation . Based on the naming convention typically found on file-sharing or backup sites, this is the first part of a split multi-part RAR archive, likely containing version 1.9.x or the 1.0 full release of the game. Game Overview game-foundation-(61629).part1.rar
: For new players, the Foundation Wiki provides a quick start guide on claiming land and gathering initial resources. Since this is labeled as part1